Article
Chemistry, Applied
Kei-ichiro Sato, Souki Ito, Tomoya Higashihara, Keita Fuchise
Summary: In this study, a method for controlled ring-opening polymerization of cyclotrisiloxane catalyzed by strong organobasic compounds was developed, leading to the synthesis of various chain-end functionalized polysiloxanes with controlled number-average molar mass and narrow molar-mass dispersity values. The successful synthesis of alpha,omega-chain-end functionalized poly(dimethylsiloxane) with azide groups was achieved, and model reactions as well as polymer-polymer coupling reactions were demonstrated using copper-catalyzed methods.
REACTIVE & FUNCTIONAL POLYMERS
(2021)
Article
Multidisciplinary Sciences
Jaewan Mun, Yuto Ochiai, Weichen Wang, Yu Zheng, Yu-Qing Zheng, Hung-Chin Wu, Naoji Matsuhisa, Tomoya Higashihara, Jeffrey B. -H. Tok, Youngjun Yun, Zhenan Bao
Summary: This study presents a simple and universal strategy to achieve intrinsically stretchable semiconducting polymers with controlled multi-scale ordering, improving their stretchability and mechanical reversibility. By incorporating two types of co-monomer units, overall crystallinity and longer-range orders are reduced while maintaining high mobility, leading to improved mechanical properties. The proposed molecular design concept is observed to be applicable to various conjugated polymer systems, resulting in enhanced mechanical properties.
NATURE COMMUNICATIONS
(2021)
Article
Polymer Science
Kosuke Terayama, Chuan-Wen Liu, Tomoya Higashihara
Summary: The study revealed that incorporating ester-carbonyl group into aromatic dibromo monomers is a key molecular design strategy to realize an efficient intramolecular Pd(0) catalyst-transfer system for the polymerization process.
Article
Polymer Science
Keita Yoshida, Jia-Fu Chang, Chu-Chen Chueh, Tomoya Higashihara
Summary: In this study, a new organic-inorganic hybrid material, PNDI-SH:PbS-QD, was synthesized and characterized. Although it showed good properties, the overall photovoltaic performance as a polymer acceptor was inferior due to downshifted energy levels and unfavorable morphology.
Article
Chemistry, Multidisciplinary
Wei-Chen Yang, Yan-Cheng Lin, Shin Inagaki, Hiroya Shimizu, Ender Ercan, Li-Che Hsu, Chu-Chen Chueh, Tomoya Higashihara, Wen-Chang Chen
Summary: In this study, polymer materials were used to simulate neural processes in a photosynaptic transistor, achieving excellent features such as long-term and short-term memory, as well as ultra-low energy consumption. This work has significant implications for the development of artificial intelligence technology.
Article
Chemistry, Multidisciplinary
Yan-Cheng Lin, Kosuke Terayama, Keita Yoshida, Ping-Jui Yu, Pin-Hsiang Chueh, Chu-Chen Chueh, Tomoya Higashihara, Wen-Chang Chen
Summary: D-A-type conjugated polymers (CPs) with diversified structure design can achieve intrinsic stretchability by applying sequential regularity control on the polymer backbone. The random structure of the CP shows near-amorphous morphology and comparable charge transport performance compared to the sequentially alternating structure. Moreover, the random CP exhibits strain-insensitive mobility-stretchability properties due to the successful percolation network of tie-chains.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Materials Science, Multidisciplinary
Shin Inagaki, Yan-Cheng Lin, Hisakazu Tanaka, Tomoyuki Koganezawa, Wen-Chang Chen, Tomoya Higashihara
Summary: A novel A-b-(B-co-C)-type terpolymer was synthesized to address the issue of irreversible damage caused by stretching in organic semiconductors for wearable electronic devices. The terpolymer showed high stretchability, stable device performance, and stable bipolar charge trapping.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Polymer Science
Kei-ichiro Sato, Yudai Hemmi, Aoto Kato, Hiroyuki Matsui, Keita Fuchise, Tomoya Higashihara
Summary: In this study, multiblock copolymers consisting of PDMS, NDI, and bithiophene units were successfully synthesized, and different materials with varying PDMS compositions were obtained. The multiblock copolymer with 10% PDMS showed typical n-type semiconducting behavior.
Article
Chemistry, Multidisciplinary
Taiki Endo, Tomoya Higashihara
Summary: Semiaromatic polyamides were synthesized by bulk polycondensation, and copolyamides were successfully obtained. The obtained polyamides had high inherent viscosity and good thermal stability, and some copolyamides were suitable for melt-drawing processes.
Article
Polymer Science
Wei-Chen Yang, Yi-Wen Chen, Yang-Yen Yu, Yan-Cheng Lin, Tomoya Higashihara, Wen-Chang Chen
Summary: This study develops a series of all-conjugated block copolymers and applies them to electronic memory devices, achieving good memory performance. The design of the all-conjugated block copolymers improves the memory-photoresponse properties in phototransistor memory and overcomes the issue of phase separation in conjugated polymer blends.
MACROMOLECULAR RAPID COMMUNICATIONS
(2023)
Review
Polymer Science
Megumi Matsuda, Kei-ichiro Sato, Kosuke Terayama, Yuto Ochiai, Kazushi Enomoto, Tomoya Higashihara
Summary: Researchers have developed a new type of intrinsically stretchable semiconducting material with good stress-releasing properties, which can be used for manufacturing wearable intelligent electronic devices. While there are already several stretchable p-type semiconducting polymers, studies on intrinsically stretchable n-type materials are still limited.
Article
Materials Science, Multidisciplinary
Shuto Yamamoto, Megumi Matsuda, Chia-Yu Lin, Kazushi Enomoto, Yan-Cheng Lin, Wen-Chang Chen, Tomoya Higashihara
Summary: In this study, the mobility-stretchability properties of n-type conjugated block copolymers were investigated. It was found that high PIB content can improve the elastic modulus and crystallinity of the polymers, leading to an improved retention rate of electron mobility.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Polymer Science
Shin Inagaki, Tomoya Higashihara
Summary: A novel ABC-type triblock copolymer, consisting of PMMA, P3HT, and PS, was synthesized by the bilateral CuAAC reaction, resulting in a high yield.
Article
Chemistry, Multidisciplinary
Yu-Cheng Tseng, Aoto Kato, Jia-Fu Chang, Wen-Chang Chen, Tomoya Higashihara, Chu-Chen Chueh
Summary: The development of single-component organic solar cells (SCOSCs) using only one photoactive component with a chemically bonded D/A structure has attracted increasing research attention. In this study, we synthesized a D-A all-conjugated polymers based on an n-type PNDI2T block and a p-type PBDB-T donor block but with three different segment ratios (P1-P3) and demonstrate the significance of the D/A segment ratio on photovoltaic performance. The results show that the n-type PNDI2T block plays a critical role in the inter/intra-chain charge transfer, and SCOSC based on P1 exhibits the highest power conversion efficiency among the synthesized CBCs.
Article
Materials Science, Multidisciplinary
Yan-Cheng Lin, Chih-Chien Hung, Chun-Kai Chen, Yun-Chi Chiang, Li-Che Hsu, Jian-Sian Li, Chu-Chen Chueh, Tomoya Higashihara, Wen-Chang Chen
Summary: In this study, side-chain-engineered D-A-type conjugated copolymers with PY electron-trapping moieties were developed to enhance charge-storage capability in FET memory devices. By controlling the PY content, improved charge-transport performance and stable charge-storage capability were achieved.
ACS APPLIED POLYMER MATERIALS
(2021)
